PRESERVATION OF THE SPECIES i8i 



9. Contrast prsecocial and altricial birds. 



10. What is the effect of ground nesting and tree nesting 

 upon the number of eggs and the care of the young? 



1 1 . Describe the metamorphosis of grasshopper, June 

 beetle, honeybee, dragon-fly, cicada, may-fly, ant-lion, 

 caddis fly. 



12. Compare the development of the crayfish, crab, and 

 lobster. What names are given to the larvae .' What is 

 the significance in the fact that the lobster hatches in the 

 " mysis stage " .' 



13. What are some of the peculiar names given to the 

 larvae in the case of echinoderms, worms, and mollusks ? 

 Why should these have received special names .■' 



14. Name the three primitive germ layers. State the 

 principal organs derived from each in the higher animals. 



15. What is ontogeny .' phylogeny.' What is the mean- 

 ing of the law " The ontogeny is an epitome of the phy- 

 logeny " ? 



16. Who was Weissman ? What important contribution 

 did he make to zoology ? 



17. With what phase of zoology is the name of T. H. 

 Morgan associated ? 



